Rails 6 Docker run rake db:seed command - ruby-on-rails

Question

I am working on rails application and it uses Docker and Kubernetes.
I do not know Docker and Kubernetes and I need to run the seed file on the production server but it's not working.
Following is my Docker file
FROM ruby:2.6.5-alpine
RUN apk update
RUN apk add bash build-base libxml2-dev libxslt-dev postgresql postgresql-dev nodejs vim
yarn libc6-compat curl
RUN mkdir /app
WORKDIR /app
COPY template-app/Gemfile* ./
RUN gem install bundler && bundle config https://gem.abc.io/xyz/ nvHuX-
OXxLY2OpiQkFVfgnYgd4ertyufdds
RUN bundle install
#RUN bundle exec rake db:seed(not working)
COPY template-app/ .
EXPOSE 3000
CMD ["bundle", "exec", "rails", "server", "-b", "0.0.0.0", "-p", "3000"]
In the Docker file, I have added RUN bundle exec rake db:seed but it's not working and my build is not passed(deployed)
I am using postgres database.
I do not have docker composer file.
Thanks.
Edit:
I got the following error when I write rake db:migrate in the docker file
Removing intermediate container 3634d992e850
---> 1bd575429f8e
Step 9/12 : RUN bundle exec rake db:seed
---> Running in f5d8c63f7db7
rake aborted!
No Rakefile found (looking for: rakefile, Rakefile, rakefile.rb, Rakefile.rb)
/usr/local/bundle/gems/rake-13.0.1/exe/rake:27:in `<top (required)>'
/usr/local/bundle/bin/bundle:23:in `load'
/usr/local/bundle/bin/bundle:23:in `<main>'
(See full trace by running task with --trace)
Edit
I have added following code in dockerfile
RUN yarn install --check-files
RUN bundle exec rake db:seed
I am able to run the seed command but get the following error
Edit
My application directory structure
Here my rails app is in template-app folder and dockerfile is outside the folder
Database.yml file
default: &default
adapter: postgresql
encoding: unicode
pool: <%= ENV["RAILS_DB_POOL"] || ENV['RAILS_MAX_THREADS'] || 5 %>
idle_timeout: <%= ENV["RAILS_IDLE_CONNECTION"] || 60 %>
port: <%= ENV['RAILS_DATABASE_PORT'] || 5432 %>
# For details on connection pooling, see Rails configuration guide
# https://guides.rubyonrails.org/configuring.html#database-pooling
development:
<<: *default
adapter: postgresql
database: <%= ENV['TEMPLATEAPP_DATABASE'] %>
username: <%= ENV['TEMPLATEAPP_DATABASE_USER'] %>
password: <%= ENV['TEMPLATEAPP_DATABASE_PASSWORD'] %>
host: <%= ENV['TEMPLATE_DATABASE_HOSTNAME'] %>
test:
<<: *default
adapter: postgresql
database: <%= ENV['TEMPLATEAPP_DATABASE'] %>
username: <%= ENV['TEMPLATEAPP_DATABASE_USER'] %>
password: <%= ENV['TEMPLATEAPP_DATABASE_PASSWORD'] %>
host: <%= ENV['TEMPLATE_DATABASE_HOSTNAME'] %>
production:
<<: *default
adapter: postgresql
database: <%= ENV['TEMPLATEAPP_DATABASE'] %>
username: <%= ENV['TEMPLATEAPP_DATABASE_USER'] %>
password: <%= ENV['TEMPLATEAPP_DATABASE_PASSWORD'] %>
host: <%= ENV['TEMPLATE_DATABASE_HOSTNAME'] %>

Answer 1

Well there are lot of things going on in your Dockerfile, first you are installing postgresql but you are not doing its initial configuration. Normal we use docker-compose file and use pre build postgresql for it with following docker image
db:
image: postgres:11
ports:
- "5432:5432"
volumes:
- '../../tmp/data/pg11:/var/lib/postgresql/data:cached'
environment:
POSTGRES_USER: postgres
POSTGRES_PASSWORD: ''
POSTGRES_HOST_AUTH_METHOD: trust
PGDATA: /var/lib/postgresql/data/pgdata
Now another issue is you are using rails 6 mean you have to run yarn to install all packages. so I also added following line
RUN yarn install --check-files
The other issue is you are running your db migration before copying your project. you can use following Dockerfile
FROM ruby:2.6.5-alpine
RUN apk update
RUN apk add bash build-base libxml2-dev libxslt-dev postgresql postgresql-contrib postgresql-dev nodejs vim yarn libc6-compat curl
RUN mkdir /app
WORKDIR /app
COPY template-app/Gemfile* ./
RUN gem install bundler
# RUN gem install bundler && bundle config https://gem.abc.io/xyz/ nvHuX-
RUN bundle install
COPY template-app/ .
RUN yarn install --check-files
RUN bundle exec rake db:seed
EXPOSE 3000
CMD ["bundle", "exec", "rails", "server", "-b", "0.0.0.0", "-p", "3000"]
But as I told you due to postgresql it wont' work, till you setup postgres and take consideration using its credentials in your config/database.yml file.
Please use following format
default: &default
adapter: postgresql
encoding: unicode
pool: <%= ENV["RAILS_DB_POOL"] || ENV['RAILS_MAX_THREADS'] || 5 %>
idle_timeout: <%= ENV["RAILS_IDLE_CONNECTION"] || 60 %>
port: <%= ENV['RAILS_DATABASE_PORT'] || 5432 %>
# For details on connection pooling, see Rails configuration guide
# https://guides.rubyonrails.org/configuring.html#database-pooling
development:
<<: *default
adapter: postgresql
database: <%= ENV['TEMPLATEAPP_DATABASE'] %>
username: <%= ENV['TEMPLATEAPP_DATABASE_USER'] %>
password: <%= ENV['TEMPLATEAPP_DATABASE_PASSWORD'] %>
host: <%= ENV['TEMPLATE_DATABASE_HOSTNAME'] %>
test:
<<: *default
adapter: postgresql
database: <%= ENV['TEMPLATEAPP_DATABASE'] %>
username: <%= ENV['TEMPLATEAPP_DATABASE_USER'] %>
password: <%= ENV['TEMPLATEAPP_DATABASE_PASSWORD'] %>
host: <%= ENV['TEMPLATE_DATABASE_HOSTNAME'] %>